Best theory as well as objective question books for wbjee.

Prefer NCERT to build your basic concept and make sure you do each and every example and exercise questions of Ncert before jumping to a reference book.
After completing ncert jump to reference book mentioned below -
1) concept of physics by HC Verma
2) OP TONDON For chemistry
3) Rd Sharma for Mathematics & arihant practice book for WBJEE
Most important solve 5 previous year question paper.

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Feel free to comment if you have any doubt
Good luck